Jump to main content
Jump to site search

Issue 31, 2009
Previous Article Next Article

Regioregularity effects in the chain orientation and optical anisotropy of composite polymer/fullerene films for high-efficiency, large-area organic solar cells

Author affiliations

Abstract

In this paper, we demonstrate the strong influence of the regioregularity (RR) of poly(3-hexylthiophene) (P3HT) on the optical anisotropy of hybrid P3HT/fullerene films before and after thermal annealing. We determined the conversion efficiency and characterized the optical anisotropy of P3HT/6,6-phenyl-C61-butyric acid methyl ester (PCBM) blends featuring various values of RR. Unlike grazing-incidence X-ray diffraction analysis, optical anisotropic measurement provides a clear and convenient view of the polymer orientation and the device anisotropic absorption at the same time. By calculating the in-plane and out-of-plane optical constants (extinction coefficients and refractive indices), we determined that the optical anisotropy of P3HT/PCBM films was improved in both orientations upon increasing the RR. Upon increasing the thermal annealing temperature, the main chains of high-RR P3HT were converted from an amorphous structure to an alignment parallel to the substrate, resulting in higher optical anisotropy. The degree of anisotropy of the high-RR P3HT/PCBM blend was up to six times higher than that of the low-RR sample. This strong RR effect on optical anisotropy was also evident in the power conversion efficiency of large-area P3HT/PCBM-based organic solar cells.

Graphical abstract: Regioregularity effects in the chain orientation and optical anisotropy of composite polymer/fullerene films for high-efficiency, large-area organic solar cells

Back to tab navigation

Publication details

The article was received on 10 Mar 2009, accepted on 15 May 2009 and first published on 10 Jul 2009


Article type: Paper
DOI: 10.1039/B904870G
Citation: J. Mater. Chem., 2009,19, 5554-5560
  •   Request permissions

    Regioregularity effects in the chain orientation and optical anisotropy of composite polymer/fullerene films for high-efficiency, large-area organic solar cells

    S. Chuang, H. Chen, W. Lee, Y. Huang, W. Su, W. Jen and C. Chen, J. Mater. Chem., 2009, 19, 5554
    DOI: 10.1039/B904870G

Search articles by author

Spotlight

Advertisements